C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/403, 402/413
C08F 212/04 (2006.01) C08F 220/28 (2006.01) C08G 18/62 (2006.01) C09D 125/14 (2006.01)
Patent
CA 1328146
Abstract Copolymers containing hydroxyl groups, based on vinyl ester monomers, vinylaromatic monomers and hydroxyalkyl ester monomers, process for the preparation thereof and use thereof in coating compositions The invention relates to copolymers containing hydroxyl groups having a hydroxyl value of 50 to 200 mg of KOH/g and an average molecular weight (number average) of 1500 to 6000, which can be prepared by free-radical solution polymerization at temperatures of 130 to 200°C of 5 to 25 % by weight of vinyl ester monomers, 10 to 50 % by weight of vinylaromatic monomers, 10 to 50 % by weight of hydroxyalkyl ester monomers and, if desired, other monomers, in which the vinyl ester is initially used and the remain- ing monomers are added over a monomer addition period which is the same for all monomers as follows: i) The amount of the acrylate monomer added per unit time remains constant. ii) The amount of the vinylaromatic hydrocarbon added over the first third of the monomer addition period is 15 to 30 % by weight, preferably 18 to 26 % by weight, that added over the second third is 25 to 40 % by weight, preferably 30 to 38 % by weight, and that added over the last third is 35 to 60 % by weight preferably 40 to 50 % by weight, of the total amount of the vinylaromatic hydrocarbon. The subject-matter of the invention is also a pro- cess for the preparation of the copolymers as well as their use in coating compositions.
604801
Jung Werner Alfons
Vorbeck Udo
Basf Lacke + Farben Aktiengesellschaft
Fetherstonhaugh & Co.
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